EP2809511A1 - Film multicouche comprenant un copolymère oléfinique cyclique - Google Patents
Film multicouche comprenant un copolymère oléfinique cycliqueInfo
- Publication number
- EP2809511A1 EP2809511A1 EP13703306.4A EP13703306A EP2809511A1 EP 2809511 A1 EP2809511 A1 EP 2809511A1 EP 13703306 A EP13703306 A EP 13703306A EP 2809511 A1 EP2809511 A1 EP 2809511A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tie
- layer
- coc
- evoh
- copolymers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 239000004713 Cyclic olefin copolymer Substances 0.000 title claims abstract description 185
- 229920000554 ionomer Polymers 0.000 claims abstract description 95
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- 238000000034 method Methods 0.000 claims abstract description 27
- 229920000098 polyolefin Polymers 0.000 claims abstract description 19
- 239000004698 Polyethylene Substances 0.000 claims description 163
- 229920000573 polyethylene Polymers 0.000 claims description 153
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- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 112
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 102
- -1 polyethylene Polymers 0.000 claims description 99
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- 239000005020 polyethylene terephthalate Substances 0.000 claims description 71
- 229920001577 copolymer Polymers 0.000 claims description 60
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- 239000000203 mixture Substances 0.000 claims description 49
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- 230000004888 barrier function Effects 0.000 claims description 40
- 229920000642 polymer Polymers 0.000 claims description 40
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 30
- 229920001519 homopolymer Polymers 0.000 claims description 20
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- 229920001038 ethylene copolymer Polymers 0.000 claims description 19
- 238000004806 packaging method and process Methods 0.000 claims description 17
- 150000001336 alkenes Chemical class 0.000 claims description 14
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 12
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- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 230000002040 relaxant effect Effects 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims 1
- 239000010410 layer Substances 0.000 description 189
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- 239000000463 material Substances 0.000 description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 12
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 10
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 9
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- 125000004122 cyclic group Chemical group 0.000 description 8
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- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 description 7
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 description 7
- 125000000217 alkyl group Chemical group 0.000 description 7
- 229920005606 polypropylene copolymer Polymers 0.000 description 7
- PGGROMGHWHXWJL-UHFFFAOYSA-N 4-(azepane-1-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1CCCCCC1 PGGROMGHWHXWJL-UHFFFAOYSA-N 0.000 description 6
- CSJJNGBTPIRXBE-UHFFFAOYSA-N 6-(azepan-1-yl)-6-oxohexanamide Chemical compound NC(=O)CCCCC(=O)N1CCCCCC1 CSJJNGBTPIRXBE-UHFFFAOYSA-N 0.000 description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
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- 150000003951 lactams Chemical class 0.000 description 6
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 5
- 241000761389 Copa Species 0.000 description 5
- 229920002292 Nylon 6 Polymers 0.000 description 5
- 125000001931 aliphatic group Chemical group 0.000 description 5
- 229920003231 aliphatic polyamide Polymers 0.000 description 5
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 5
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 239000004711 α-olefin Substances 0.000 description 5
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 description 4
- 239000004953 Aliphatic polyamide Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 4
- 239000001361 adipic acid Substances 0.000 description 4
- 235000011037 adipic acid Nutrition 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 4
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- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 239000002346 layers by function Substances 0.000 description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 3
- FQLAJSQGBDYBAL-UHFFFAOYSA-N 3-(azepane-1-carbonyl)benzamide Chemical compound NC(=O)C1=CC=CC(C(=O)N2CCCCCC2)=C1 FQLAJSQGBDYBAL-UHFFFAOYSA-N 0.000 description 3
- OECUQWQIGXMPAN-UHFFFAOYSA-N 6-oxo-6-pyrrolidin-1-ylhexanamide Chemical compound NC(=O)CCCCC(=O)N1CCCC1 OECUQWQIGXMPAN-UHFFFAOYSA-N 0.000 description 3
- 229920003313 Bynel® Polymers 0.000 description 3
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical class NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 3
- 101100481408 Danio rerio tie2 gene Proteins 0.000 description 3
- 101100481410 Mus musculus Tek gene Proteins 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 125000003368 amide group Chemical group 0.000 description 3
- 150000001413 amino acids Chemical class 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical compound CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 3
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
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- 235000013305 food Nutrition 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
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- 239000004707 linear low-density polyethylene Substances 0.000 description 3
- 235000013372 meat Nutrition 0.000 description 3
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 3
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- 238000006116 polymerization reaction Methods 0.000 description 3
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- 229920005604 random copolymer Polymers 0.000 description 3
- 229920006300 shrink film Polymers 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 229920001897 terpolymer Polymers 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- OJOWICOBYCXEKR-APPZFPTMSA-N (1S,4R)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound CC=C1C[C@@H]2C[C@@H]1C=C2 OJOWICOBYCXEKR-APPZFPTMSA-N 0.000 description 2
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
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- 238000005984 hydrogenation reaction Methods 0.000 description 2
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Classifications
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the invention relates to a coextruded multilayer film structure comprising cyclic olefin copolymer that can be used in packaging such as in food packaging applications.
- a solution to such puncture resistance requirements can be provided by a multilayer film comprising a layer containing polyamide, or blends thereof.
- EP1296830 describes a multilayer film comprising an intermediate layer of polyamide having good puncture resistance properties, suitable for packaging deep-frozen foods such as ribs and seafood such as crabs.
- such multilayer films must also display other properties such as the tendency to shrink under the influence of heat and adopt the form of the packaged good, a property known as "heat shrink".
- lonomers are known for their excellent ability to shrink under heat, and depending on the degree of neutralization of the ionomer, the "heat shrink" of a multilayer film comprising a layer of ionomer can reach 50% and even higher values.
- multilayer films comprising a layer of ionomer have only moderate puncture resistance compared to similar multilayer structures that contain stiffer components such as polyamide and are therefore not used extensively to package sharp or pointy edges such as meat cuts having salient bone fragments or splinters.
- blends of polyamide and ionomer would result in a polymeric material combining the puncture resistance of polyamide and heat shrink performance of ionomers, but to a strongly diminished extent, making such compositions less desirable.
- EP1423408 discloses sealant layers comprising blends of ionomers and cyclic olefin polymers having relatively good puncture resistance, but is silent on the heat shrink behavior of such blends in oriented multilayer films.
- a multilayer film structure preferably coextruded instead of laminated, comprising, in order, at least one puncture resistant layer comprising at least one cyclic olefin copolymer and at least one ionomer or polyolefin; at least one tie layer; and at least one sealant layer; wherein the film is either monoaxially oriented or biaxially oriented and obtained by a triple bubble process; and the film structure has a puncture resistance of at least 2 J/mm, wherein the puncture resistance is measured according to DIN14477 at a speed of 1 mm/min using a rod bearing a spherical ball at its tip, the rod having a diameter of 2 mm and the spherical ball having a diameter of 2.5 mm.
- the multilayer film structure is obtainable by, or obtained by, a triple bubble process, and may be either monoaxially oriented or biaxially oriented.
- the triple bubble process allows the manufacturing of these structures in one step through coextrusion, rather than laminating a biaxially oriented outer film (e.g. polyester) to the layers containing COC blends with polyolefins or ionomers. This can significantly reduce the cost of the packaging film. Also in this case, the entire film is oriented rather than just selected layers, allowing for more consistent shrink properties.
- a biaxially oriented outer film e.g. polyester
- the invention also provides a (triple bubble) process for
- the tubular multilayer film structure comprises at least one puncture resistant layer as characterized above. That is, the puncture resistant layer comprises at least one COC and at least one ionomer or polyolefin.
- the oriented film is either mono-axially oriented or biaxially oriented.
- the invention provides an article, in particular a packaging article, comprising the above-mentioned multilayer film structures.
- FIG. 1 shows a schematic overview of the triple bubble process of the invention, as described below.
- the invention provides a multilayer film structure, preferably coextruded, comprising, in this order, at least one puncture resistant layer comprising at least one COC and at least one ionomer or polyolefin, at least one tie layer and at least one sealant layer.
- a preferred multilayer film structure is one wherein the at least one puncture resistant layer comprises at least one cyclic olefin copolymer and at least one ionomer, at least one cyclic olefin copolymer and
- the tie layer comprises olefin homopolymers and/or copolymers, preferably polyethylene homopolymers or copolymers, propylene homopolymers or copolymers, or mixtures thereof, or ethylene copolymers, preferably ethylene a-olefin copolymers, ethylene vinyl acetate copolymers, ethylene alkyl (meth)acrylate copolymers, or polymers or copolymers modified with acid, anhydride or epoxide functionalities; and the sealant layer comprises olefin homopolymers and/or copolymers chosen among polyethylene, propylene homopolymers andcopolymers, ethylene copolymers, preferably ethylene (meth)acrylic acid copolymers and their corresponding ionomers, and/or mixtures thereof.
- Puncture resistance denotes the relative ability of a material to inhibit the progression of penetration of a sharp object once it has been pierced by it.
- Tests devised to measure puncture resistance are generally application-specific, covering items such as roofing, packing materials, protective garments, and needle-resistant materials.
- a puncture resistant material can resist a specific pierce force per unit thickness, by a 25 gauge needle perpendicular to the material, between 0.1 to 150N/mm, 0.1 to 100N/mm, 1 to 50N/mm, 1 to 20N/mm, or 1 to 10N/mnn, 50 to 150N/mm, 50 to 100N/mnn, or in form of a specific energy per unit thickness in J/mm.
- it can be from 0.1 to 20 or from 1 to 10 J/mm.
- the puncture resistance can be measured according to a
- films as described herein have puncture resistance in this test of at least 2 J/mm, such as from 2 to 10 J/mm, preferably from 3 to 8 J/mm.
- the puncture resistant layer of the multilayer film structures comprises at least one COC and at least one ionomer or polyolefin.
- the puncture resistant layer of the coextruded multilayer film structure may be essentially free of polyamides such as for example semi- crystalline and amorphous polyamides, i.e. the puncture resistant layer of the coextruded multilayer film structure may not comprise a polyamide, such as for example semi-crystalline and amorphous polyamides.
- the puncture resistant layer may comprise from 10 to 99, 10 to 40, 10 to 30, 40 to 95, 55 to 95, or 60 to 95 weight % of the COC, based on the total weight of the puncture resistant layer.
- COC includes copolymers of unsaturated cyclic monomers, and may be obtained by either chain polymerization of one or more
- unsaturated cyclic monomers with one or more unsaturated linear monomer such as for example ethylene may be obtained by ring- opening metathesis of one or more unsaturated cyclic monomers and subsequent hydrogenation.
- Examples of unsaturated cyclic monomers may be chosen from, without limitation, norbornene and derivatives thereof such as for example 2-norbornene, 5-methyl-2-norbornene, 5,5-dimethyl-2-norbornene, 5-butyl- 2-norbornene, 5-ethylidene-2-norbornene, 5-methoxycarbonyl-2- norbornene, 5-cyano-2-norbornene, 5-methyl-5-methoxycarbonyl-2- norbornene, and 5-phenyl-2-norbornene; cyclopentadiene and derivatives thereof such as for example dicyclopentadiene and 2,3- dihydrocyclopentadiene; and combinations of two or more thereof.
- norbornene and derivatives thereof such as for example 2-norbornene, 5-methyl-2-norbornene, 5,5-dimethyl-2-norbornene, 5-butyl- 2-norbornene, 5-ethylidene-2-n
- Examples of unsaturated linear monomer may be chosen, without limitation, from alkenes having 1 to 20, preferably from 1 to 12 carbon atoms, most preferably from 1 to 6 carbon atoms, such as for example alpha-olefins, for example ethylene, propylene, and butylene.
- unsaturated linear monomers may be chosen from 1 -butene, 4-methyl-1 - pentene, 1 -hexene, 1 -octene, 1 -decene, 1 -dodecene, 1 -tetradecene, 1 -hexadecene, 1 -octadecene and 1 -eicocene, cydopentene, cydohexane, 3-methylcyclohexene, cyclooctene, 1 ,4-hexadiene, 4-methyl-1 ,4- hexadiene, 5-methyl-1 ,4-hexadiene, 1 ,7-octadiene, dicyclopentadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, tetracyclododecene, 2-methyltetracyclododecene, and 2-ethy
- Examples of COC obtained by chain polymerization of one or more unsaturated cyclic monomers with one or more unsaturated linear monomer can include copolymers of ethylene and norbornene, ethylene and tetracyclododecene.
- COC polymers are generally, or even completely, amorphous, highly transparent and have very high moisture barrier properties, roughly twice that of HDPE and five times that of LDPE.
- COC may be chosen among cyclic olefin copolymers having a glass transition temperature (Tg) of from 60 to 150 °C or from 70 to 100 °C.
- Examples of COC obtained by ring-opening metathesis of one or more unsaturated cyclic monomers and subsequent hydrogenation can include hydrogenated polynorbornene.
- the COC may be chosen from cyclic olefin copolymers having at least 15, from 15 to 90, or from 15 to 40 mole percent of unsaturated cyclic monomers.
- the cycloolefin polymers can be prepared with the aid of transition- metal catalysts. Preparation processes are described, for example, in DD-A-109 225, EP-A-0 407 870, EP-A-0 485 893, U.S. Patents 5,869,586 and 6,068,936, and WO98/27126.
- Molecular weight regulation during the preparation can advantageously be effected using hydrogen. Suitable molecular weights can also be established through targeted selection of the catalyst and reaction conditions. Details in this respect are given in the above mentioned specifications.
- Suitable cycloolefin polymers are the products sold under the trademark Topas ® by Ticona.
- the puncture resistant layer may also comprise an ionomer based on an E/X/Y acid copolymer where E is ethylene, X is a C3 to Cs ⁇ , ⁇ - ethylenically unsaturated carboxylic acid, and Y is an optional comonomer selected from alkyl acrylate and alkyl methacrylate.
- Suitable C 3 to C 8 ⁇ , ⁇ -ethylenically unsaturated carboxylic acids may be chosen, for example, among methacrylic acid and acrylic acid.
- the C3 to Cs ⁇ , ⁇ -ethylenically unsaturated carboxylic acid may be present in an amount from 2 to 30, 5 to 20, or 12 to 19 weight percent, based on the total weight of the acid copolymer.
- the optional comonomer Y may be present in an amount from 0.1 to 40, 0.1 to 10 weight %, based on the weight of the E/X/Y copolymer, or not present at all.
- the carboxylic acid functionalities present in the E/X/Y copolymer can be at least partially neutralized to salts containing one or more alkali metal, transition metal, or alkaline earth metal cations such as for example sodium, zinc, lithium, magnesium, or calcium.
- an ionomer may be chosen among E/X copolymers where E is ethylene and X is methacrylic acid at least partially neutralized by zinc or sodium.
- Suitable polymers for use in the present invention are the ionomers commercially available under the trademark Surlyn ® from E. I. du Pont de Nemours and Company (DuPont).
- Example ionomers include a
- MFI melt flow index
- the puncture resistant layer may also comprise a polyolefin chosen among polyethylene homopolymers, polyethylene copolymers,
- polypropylene homopolymers or polypropylene copolymers and/or mixtures thereof are examples of polypropylene homopolymers or polypropylene copolymers and/or mixtures thereof.
- Non-limiting examples of polyethylene homopolymers and/or copolymers (wherein ethylene is the major comonomer) suitable for use as a component of the puncture resistant layer or in tie layers (described further below) in the coextruded multilayer film structure are, for example, ultra low density polyethylene (ULDPE), very low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLPE), high density polyethylene (HDPE) or metallocene polyethylene (mPE).
- Polyethylene homopolymers and/or copolymers may be made by any available process known in the art including high pressure gas, low pressure gas, solution and slurry processes employing conventional Ziegler-Natta, metallocene, and late transition metal complex catalyst systems.
- Polypropylene homopolymers and/or copolymers such as random copolymers, block copolymers and terpolymers of propylene include copolymers of propylene (wherein propylene is the major comonomer) with other olefins such as ethylene, 1 -butene, 2-butene and the various pentene isomers, and terpolymers of propylene such as copolymers of propylene with ethylene and one other olefin, and random copolymers (statistical copolymers) that have propylene and the comonomer(s) randomly distributed throughout the polymeric chain in ratios
- Suitable block copolymers are made up of chain segments consisting of propylene homopolymer and of chain segments consisting of, for example, random copolymers of propylene and ethylene.
- Polypropylene homopolymers and/or copolymers can be any polypropylene homopolymers and/or copolymers.
- Block copolymers can be manufactured similarly, except that propylene is generally first polymerized by itself in a first stage and propylene and additional comonomers such as ethylene are then polymerized, in a second stage, in the presence of the polymer obtained during the first. Because the processes for making polypropylenes are well known to one skilled in the art, the description thereof is omitted herein for the interest of brevity.
- the thickness of the puncture resistant layer may depend on the specific end-use of the coextruded multilayer film structure and can range from 5 to 60 ⁇ or from 10 to 30 ⁇ .
- the thickness of the puncture resistant layer may range from 5 to 90%, 10 to 70%, or 20 to 50%, of the total thickness of the coextruded multilayer film structure.
- the coextruded multilayer film structure comprises at least one tie layer.
- the tie layer serves to adhere the puncture resistant layer to a sealant layer and/or other adjacent layers. In the case where the tie layer serves to adhere the at least one puncture resistant layer to the at least one sealant layer, the tie layer is adjacent to at least one sealant layer and the puncture resistant layer. Stated alternatively, the tie layer is sandwiched between the puncture resistant layer and the sealant layer.
- the tie layer may comprise one or more olefin homopolymers and/or copolymers, as described above.
- the one or more olefin homopolymers and/or copolymers are chosen among polyethylene homopolymers and/or copolymers, propylene homopolymers and/or copolymers, and/or mixtures thereof.
- a noted tie layer comprises one or more ethylene copolymers.
- Ethylene copolymer refers to a polymer comprising repeat units derived from ethylene and at least one additional monomer.
- the additional monomer may be another a-olefin, or a monomer with a polar functional group.
- the ethylene copolymers may be chosen among ethylene a-olefin copolymers, ethylene vinyl acetate copolymers, ethylene alkyl
- (meth)acrylate copolymers such as ethylene methyl (meth)acrylate copolymers, ethylene ethyl (meth)acrylate copolymers, ethylene butyl (meth)acrylate copolymers, or combinations of two or more thereof.
- Alkyl (meth)acrylate refers to alkyl acrylate and/or alkyl methacrylate.
- the ethylene copolymer can be an ethylene ⁇ -olefin copolymer which comprises ethylene and an ⁇ -olefin of 3 to 20 or 4 to 8 carbon atoms.
- the density of the ethylene ⁇ -olefin copolymers can range from 0.860 g/cm 3 to 0.925 g/cm 3 , from 0.860 g/cm 3 to 0.91 g/cm 3 , or between 0.880 g/cm 3 to 0.905 g/cm 3 .
- Resins made by Ziegler-Natta type catalysis and by metallocene or single site catalysis are included provided they fall within the density ranges so described.
- the metallocene or single site resins useful herein are (i) those which have an 1-10/1-2 ratio of less than 5.63 and an Mw/Mn (polydispersivity) of greater than (1-10/l-2)-4.63, and (ii) those based which have an 1-10/1-2 ratio of equal to or greater than 5.63 and a polydispersivity equal to or less than (1-10/1-2) - 4.63.
- the metallocene resins of group (ii) may have a polydispersivity of greater than 1 .5 but less than or equal to (1-10/1-2) - 4.63.
- Conditions and catalysts which can produce substantially linear metallocene resins are described in U.S. Patent 5,278,272.
- the reference gives full descriptions of the measurement of the well-known rheological parameters 1-10 and I-2, which are flow values under different load and hence shear conditions. It also provides details of measurements of the well-known Mw/Mn ratio determination, as determined by gel-permeation chromatography (GPC).
- the ethylene copolymers may be ethylene copolymerized with a a monomer comprising a polar functional group such as vinyl acetate or alkyl (meth)acrylates.
- the relative amount of copolymerized vinyl acetate units may be of from 2 to 40, 10 to 40, 10 to 30, or 15 to 28, weight %, based on the total weight of the ethylene vinyl acetate copolymer.
- a mixture of two or more different ethylene vinyl acetate copolymers may be used as components of the tie layer in place of a single copolymer.
- Ethylene alkyl (meth)acrylate copolymers are thermoplastic ethylene copolymers derived from the copolymerization of ethylene comonomer and at least one alkyl (meth)acrylate comonomer, wherein the alkyl group contains from one to ten carbon atoms and preferably from one to four carbon atoms.
- the relative amount of copolymerized alkyl (meth)acrylate units may be of from 0.1 to 45, 5 to 35, or 8 to 28 weight percent, based on the total weight of the ethylene alkyl (meth)acrylate copolymer.
- An example ethylene alkyl (meth)acrylate copolymer is a copolymer of ethylene and 16% ethyl acrylate, melt flow index (MFI) of 1 .
- the olefin homopolymers and/or ethylene copolymers may be modified copolymers, meaning that the copolymers are grafted and/or copolymerized with organic functionalities.
- Modified polymers for use in the tie layer may be modified with acid, anhydride and/or epoxide functionalities.
- acids and anhydrides used to modify polymers which may be mono-, di- or polycarboxylic acids are acrylic acid, methacrylic acid, maleic acid, maleic acid monoethylester, fumaric acid, itaconic acid, crotonic acid, itaconic anhydride, maleic anhydride and substituted maleic anhydride, e.g. dimethyl maleic anhydride or citrotonic anhydride, nadic anhydride, nadic methyl anhydride, and
- olefin homopolymer and/or copolymer may contain from 0.05 to 25 weight percent of an acid, based on the total weight of the modified polymer.
- anhydride-modified polymer When used, it may contain from 0.03 to 10, or 0.05 to 5 weight percent of an anhydride, based on the total weight of the modified polymer.
- epoxides used to modify polymers can include unsaturated epoxides comprising from four to eleven carbon atoms, such as glycidyl (meth)acrylate, allyl glycidyl ether, vinyl glycidyl ether and glycidyl itaconate, glycidyl (meth)acrylates being particularly preferred.
- Epoxide-modified ethylene copolymers may contain from 0.05 to 15 weight % of an epoxide, based on the total weight of the modified ethylene copolymer.
- Epoxides used to modify ethylene copolymers can include glycidyl (meth)acrylates.
- An ethylene/glycidyl (meth)acrylate copolymer may further contain copolymerized units of an alkyl
- (meth)acrylate having from one to six carbon atoms and an a-olefin having 1 to 8 carbon atoms.
- Representative alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl
- the ⁇ -olefin may be selected from the group of propylene, octene, butene and hexane, especially propylene.
- Modified ethylene copolymers can be modified with acid, anhydride and/or glycidyl (meth)acrylate functionalities.
- Olefin homopolymers and/or copolymers and modified polymers are commercially available under the trademarks APPEEL ® , BYNEL ® ,
- Ethylene copolymers can be produced by any means known to one skilled in the art using either autoclave or tubular reactors (e.g. U.S.
- the thickness of the tie layer of the multilayer structure may be between 1 and 100 ⁇ , 5 and 50 ⁇ , or 5 to 30 ⁇ .
- the coextruded multilayer film structure also comprises at least one sealant layer.
- the sealant layer serves to adhere the film structure to any suitable substrate or to itself, and may comprises one or more olefin homopolymers and/or copolymers capable of fusion bonding on and to any suitable substrate or to itself by conventional means such as heat sealing.
- the sealant layer may comprise olefin homopolymers and/or copolymers chosen among polyethylene, propylene homopolymers and/or copolymers, ethylene copolymers such as for example ethylene
- the sealant layer may also include these homopolymers or copolymers blended with other polymers.
- a polyethylene may be blended with polybutylene to provide a sealant with enhanced peelability.
- sealant layer comprising at least one ionomer such as disclosed above.
- the ionomer in the sealant layer be the same as that in the puncture resistant layer or it may be different.
- the multilayer film structure may further comprise at least one barrier layer and wherein said barrier layer is between the at least one puncture resistant layer and the at least one sealant layer, preferably wherein the barrier layer comprises ethylene vinyl alcohol copolymer (EVOH), COC, and blends thereof with polyethylene, polyvinyl alcohol and polyamides.
- the barrier layer comprises ethylene vinyl alcohol copolymer (EVOH), COC, and blends thereof with polyethylene, polyvinyl alcohol and polyamides.
- EVOH ethylene vinyl alcohol copolymer
- COC ethylene vinyl alcohol copolymer
- blends thereof with polyethylene, polyvinyl alcohol and polyamides depending on the desired barrier effect (e.g. a moisture barrier and/or oxygen barrier).
- Such a barrier layer may be one or more layers combined.
- the coextruded multilayer film structure may also comprise a barrier layer consisting of a layer of EVOH, which is adjacent to and between two layers comprising a polyamide or a COC or comprising a blend of COC and polyethylene, polypropylene or ionomer.
- the coextruded multilayer film structure may also comprise a barrier layer consisting of a layer of EVOH flanked, on each side, by a layer comprising polyamide, COC, or a blend of COC and polyethylene, polypropylene or ionomer.
- tie layer(s) may be present between the barrier layer and the layer comprising polyamide or COC or a blend of COC and polyethylene, polypropylene or ionomer.
- a preferred multilayer film structure is one wherein the at least one barrier layer consists essentially of a layer of ethylene vinyl alcohol copolymer between at least two layers each independently comprising a polyamide or a blend of cyclic olefin copolymer and polyethylene or polypropylene or ionomer.
- a preferred embodiment is the multilayer structure wherein the at least one barrier layer consists of a layer of ethylene vinyl alcohol copolymer (EVOH) between two layers comprising a blend of cyclic olefin copolymer and ionomer, polyethylene or polypropylene, optionally with tie layers between the layer of EVOH and the layers comprising a blend of cyclic olefin copolymer and ionomer, polyethylene or polypropylene.
- EVOH ethylene vinyl alcohol copolymer
- the multilayer structure wherein the at least one barrier layer consists of a layer of ethylene vinyl alcohol copolymer (EVOH) adjacent to and between two layers comprising a polyamide.
- EVOH ethylene vinyl alcohol copolymer
- EVOH polymers generally have an ethylene content of between about 15 mole percent to about 60 mole percent, more preferably between about 20 to about 50 mole percent.
- the density of commercially available EVOH generally ranges from between about 1 .12 g/cm 3 to about
- EVOH polymers can be prepared by well-known techniques or can be obtained from commercial sources.
- EVOH copolymers may be prepared by saponifying or hydrolyzing ethylene vinyl acetate copolymers.
- EVOH may also be known as hydrolyzed ethylene vinyl acetate (HEVA) copolymer.
- the degree of hydrolysis is preferably from about 50 to 100 mole percent, more preferably from about 85 to 100 mole percent.
- the weight average molecular weight, M w , of the EVOH component useful in the structures of the invention may be in the range of 5,000 Daltons to 300,000 Daltons with 50,000 to 70,000 Daltons, such as 60,000 Daltons, being most preferred.
- Suitable EVOH polymers may be obtained from Eval Company of America or Kuraray Company of Japan under the tradename EVALTM.
- EVOH is also available under the tradename SOARNOL ® from Noltex L.L.C.
- Examples of such EVOH resins include EVALTM F101 , EVALTM E105, EVALTM J102, and SOARNOL ® DT2903, SOARNOL ® DC3203 and SOARNOL ® ET3803.
- the EVOH is orientable from about 3x3 to about 10x10 stretch without loss in barrier properties from pinholing, necking or breaks in the EVOH layer.
- EVALTM SP is a type of EVOH that exhibits enhanced plasticity and that is suited for use in packaging applications including shrink film.
- Examples of such EVOH resins include EVALTM SP 521 , EVALTM SP 292 and EVALTM SP 482.
- the EVALTM SP grades of EVOH are easier to orient than the conventional EVALTM resins.
- These EVOH polymers are a preferred class for use in the multilayer oriented heat shrinkable films of this invention.
- the enhanced orientability of the EVALTM SP EVOH resins derives from their chemical structure, in particular the relatively high level of head to head adjacent hydroxyl groups in the EVOH polymer chain.
- head to head adjacent hydroxyl groups is meant 1 ,2-glycol structural units.
- relatively high is meant from about 2 to about 8 mole % 1 ,2-glycol structural units are present in the EVOH polymer chain.
- about 2.8 to about 5.2 mole % 1 ,2-glycol units will be present.
- the barrier layer may comprise EVOH and be sandwiched between two puncture resistant layers, or stated alternatively, the at least one barrier layer is adjacent to and between the at least two puncture resistant layers.
- the multilayer film structure may comprise at least two puncture resistant layers comprising at least one cyclic olefin copolymer and at least one ionomer or polyolefin, preferably wherein the polyolefin is polyethylene or polypropylene; at least one barrier layer, wherein the at least one barrier layer is between the at least two puncture resistant layers; at least one tie layer; and at least one sealant layer.
- the multilayer structure may further comprise an outer layer comprising a polyamide, polycarbonate, polyester, preferably polyethylene terephthalate, or polyolefin.
- the outer layer may give the coextruded multilayer film structure mechanical resistance and/or printability, and/or may further comprise one or more additional functional layers such as barrier layers and/or other functional layers located between the at least one puncture resistant layer and the at least one sealant layer.
- outer layer it is meant a layer that is the outermost layer of the coextruded multilayer film structure, on the face opposite to that of the sealant layer, i.e. a layer forming the outer face of the structure on the face opposite to that of the sealant layer.
- the outer layer is the layer that serves as the exterior face of the tubular structure.
- the outer layer is the layer furthest from the product.
- the outer layer may be chosen from polycondensates such as polyamides, polyesters and polycarbonates or from polyolefins.
- Polyamides abbreviated herein as PA
- PA polyamides
- dicarboxylic acids condensation products of one or more dicarboxylic acids and one or more diamines, and/or one or more aminocarboxylic acids such as
- Polyamides may be fully aliphatic or semiaromatic.
- Polyamides from single reactants such as lactams or amino acids referred to as AB type polyamides are disclosed in Nylon Plastics (edited by Melvin L. Kohan, 1973, John Wiley and Sons, Inc.) and include nylon-6, nylon-1 1 , nylon-12, or combinations of two or more thereof.
- Polyamides prepared from more than one lactam or amino acid include nylon-6, 12.
- polyamides useful as a component of the outer layer include those prepared from condensation of diamines and diacids, referred to as AABB type polyamides (including nylon-66, nylon-610, nylon-612, nylon-1010, and nylon-1212), as well as from a combination of lactams, diamines and diacids such as nylon-6/66, nylon-6/610, nylon- 6/66/610, nylon-66/610, or combinations of two or more thereof.
- AABB type polyamides including nylon-66, nylon-610, nylon-612, nylon-1010, and nylon-1212
- lactams diamines and diacids
- diamines and diacids such as nylon-6/66, nylon-6/610, nylon- 6/66/610, nylon-66/610, or combinations of two or more thereof.
- Fully aliphatic polyamides used in the resin composition are formed from aliphatic and alicyclic monomers such as diamines, dicarboxylic acids, lactams, aminocarboxylic acids, and their reactive equivalents.
- the term "fully aliphatic polyamide” also refers to copolymers derived from two or more such monomers and blends of two or more fully aliphatic polyamides. Linear, branched, and cyclic monomers may be used.
- Carboxylic acid monomers comprised in the fully aliphatic
- polyamides include, but are not limited to aliphatic dicarboxylic acids, such as for example adipic acid (C6), pimelic acid (C7), suberic acid (C8), azelaic acid (C9), decanedioic acid (C10), dodecanedioic acid (C12), tridecanedioic acid (C13), tetradecanedioic acid (C14), and
- Diamines can be chosen among diamines with four or more carbon atoms, including but not limited to tetramethylene diamine, hexamethylene diamine, octamethylene diamine, decamethylene diamine, dodecamethylene diamine, 2 methylpentamethylene diamine, 2-ethyltetramethylene diamine, 2 methyloctamethylenediamine; trimethylhexamethylenediannine, meta-xylylene diamine, and/or mixtures thereof.
- Semi-aromatic polyamides include a homopolymer, a copolymer, a terpolymer or more advanced polymers formed from monomers containing aromatic groups.
- One or more aromatic carboxylic acids may be terephthalic acid or a mixture of terephthalic acid with one or more other carboxylic acids, such as isophthalic acid, phthalic acid, 2-methyl terephthalic acid and naphthalic acid.
- the one or more aromatic carboxylic acids may be mixed with one or more aliphatic dicarboxylic acids, as disclosed above.
- an aromatic diamine such as meta-xylylene diamine (MXD) can be used to provide a semi- aromatic polyamide, an example of which is MXD6, a homopolymer comprising MXD and adipic acid.
- MXD meta-xylylene diamine
- Preferred polyamides disclosed herein are homopolymers or copolymers wherein the term copolymer refers to polyamides that have two or more amide and/or diamide molecular repeat units.
- homopolymers and copolymers are identified by their respective repeat units.
- the repeat units are listed in decreasing order of mole % repeat units present in the copolymer. The following list exemplifies the abbreviations used to identify monomers and repeat units in the homopolymer and copolymer polyamides:
- HMD hexamethylene diamine or 6 when used in combination with a diacid
- the term "6" when used alone designates a polymer repeat unit formed from ⁇ -caprolactam.
- a diacid such as T, for instance 6T
- the “6” refers to HMD.
- the diamine is designated first.
- the first "6” refers to the diamine HMD
- the second "6” refers to adipic acid.
- repeat units derived from other amino acids or lactams are designated as single numbers designating the number of carbon atoms.
- the polyamide composition comprises one or more polyamides selected from among the following groups (wherein PA is shorthand for polyamide or "nylon-”):
- Group I polyamides may have semiaromatic repeat units to the extent that the melting point is less than 210 °C and generally the semiaromatic polyamides of the group have less than 40 mole percent of semiaromatic repeat units.
- Semiaromatic repeat units are defined as those derived from monomers selected from one or more of the group consisting of aromatic dicarboxylic acids having 8 to 20 carbon atoms and aliphatic diamines having 4 to 20 carbon atoms.
- Notable Group I polyamides include PA6/66, PA6/610, PA6/66/610, PA6/6T, PA1010, PA1 1 and PA12.
- Group II polyamides have a melting point of at least 210 °C, comprising an aliphatic polyamide such as poly(tetramethylene hexanediamide) (PA46), poly(£-caprolactam) (PA6), poly(hexamethylene hexanediamide/(£-caprolactann) (PA66/6), poly(hexamethylene
- poly(hexamethylene hexanediamide/hexamethylene dodecanediamide) PA66/612
- poly(hexamethylene hexanediamide/decamethylene decanediamide) PA66/1010
- PA610 poly(hexamethylene decanediamide)
- PA612 poly(hexamethylene dodecanediamide)
- PA614 poly(hexamethylene tetradecanediamide)
- PA616 poly(hexamethylene hexadecanediamide)
- PA46/D6 poly(tetramethylene hexanediamide/2- methylpentamethylene hexanediamide)
- Notable Group II polyamides include PA6, PA66, PA610 and PA612.
- Group III polyamides have a melting point of at least 210 °C and comprise
- poly(tetramethylene hexanediamide/hexamethylene terephthalamide) PA46/6T
- poly(tetramethylene hexanediamide/2-methylpentamethylene hexanediamide/decamethylene terephthalamide) PA46/D6/10T
- poly(hexamethylene hexanediamide/hexamethylene terephthalamide) PA66/6T
- PA66/6I/6T poly(hexamethylene hexanediamide/2-methylpentamethylene
- PA66/D6/6T hexanediamide /hexamethylene terephthalamide
- a preferred Group III polyamide is PA 66/6T.
- Group IV polyamides have no melting point and include
- PA6I/6T poly(hexamethylene isophthalamide/hexamethylene terephthalamide)
- PA6I/6T poly(hexamethylene isophthalamide/hexamethylene terephthalamide/hexamethylene hexanediamide)
- PA6I/6T/66 poly(hexamethylene isophthalamide/hexamethylene terephthalamide/hexamethylene hexanediamide)
- the polyamide is a Group I polyamide, Group II
- polyamides with a lower ratio of methylene units to amide groups especially those with a ratio of five or less methylene units per amide group such as PA6, PA66, PA6/66 and most especially PA6 and PA66.
- polyamides with a ratio of methylene units to amide groups of 5 to 9 such as PA612, PA610, PA612, PA6/610, and PA6/66/610.
- Preferred polyamides include PA6, PA66, PA610, PA612, PA6/66, PA6/610, PA6/66/610, PA6/6T, and combinations thereof. More preferred polyamides include PA6, PA66, PA610, PA612, and combinations thereof, with PA6 most preferred.
- the polyamides may also be blends of two or more polyamides.
- Preferred blends include those selected from the group consisting of Group I and Group II polyamides, Group I and Group III polyamides, Group I and Group VI polyamides, Group II and Group III polyamides, Group II and Group IV polyamides.
- Suitable polyamides or copolymers thereof may be chosen among aliphatic or semi-aromatic polyamides including PA6, PA66, PA610, PA6T, PA6.66, PA10, PA1 1 or PA12. Of note is a blend of nylon-6 and nylon- 66/610.
- Suitable polyesters and copolymers thereof may be chosen among aliphatic polyesters such as polyhydroxyalkanoic acids like for example polylactic acid or poly(3-hydroxybutyrate) or among semi-aromatic polyesters like for example polyethylene terephthalate and copolymers thereof such as PETG, polytrimethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate. Polyesters and processes for making them are well known to those skilled in the art, so the disclosure of which is omitted in the interest of brevity.
- Suitable polyolefins for use in the outer layer may be chosen from various types of polyethylene, polypropylene, polystyrene and ethylene copolymers, as described above.
- Each layer of the coextruded multilayer film structure may independently further comprise, based on the weight of the layer, from about 0.0001 to about 20%, modifiers and other additives, including without limitation, plasticizers, impact modifiers, stabilizers including viscosity stabilizers and hydrolytic stabilizers, lubricants, antioxidants, UV light stabilizers, antifog agents, antistatic agents, dyes, pigments or other coloring agents, fillers, flame retardant agents, reinforcing agents, grafting agents, foaming and blowing agents and processing aids known in the polymer compounding art; for example antiblock agents and release agents; and combinations of two or more thereof.
- additives may be present in the polymer compositions of each of the layers independently in amounts of up to 20, such as 0.01 to 7, or 0.01 to 5, weight %.
- Exemplary structures according to this invention may be the coextruded multilayer structures summarized below.
- the layers are listed from left to right in order from outer layer (furthest away from the interior of the package or tubular structure) to inner layer (closest to the interior of the package or tubular structure).
- outer layers include polyethylene terephthalate (PET) or polyamide (PA).
- Puncture-resistant layers include blends of cyclic olefin copolymer and ionomer (COC+IO), blends of cyclic olefin copolymer and polypropylene (COC+PP) and blends of cyclic olefin copolymer and polyethylene (COC+PE).
- a single layer barrier layer may be EVOH.
- Multilayer barrier layers include COC+PE/tie/EVOH/tie/COC+PE,
- Sealant layers include polyethylene (PE), and ionomer (IO). Blends of polyethylene and polybutylene (PE+PB) provide sealant layers with easier peelability. PET/tie/PE/COC+IO/tie/EVOH/tie/PE
- the ionomer sealant layer and the COC+IO, COC+PE or the COC+PP layer may further enhance the puncture resistance and shrinking ability and reduce the tendency of the coextruded multilayer film structure to curl.
- a preferred film structure comprises the layers of PET/tie/puncture resistant layer/COC+PE/tie/EVOH/tie/COC+PE/tie/PE wherein PET represents a polyethylene terephthalate outer layer, the puncture resistant layer comprises a blend of cyclic olefin copolymer and ionomer or cyclic olefin copolymer and polypropylene, the barrier layer comprises
- COC+PE/tie/EVOH/tie/COC+PE COC+PE/tie/EVOH/tie/COC+PE
- PE represents a polyethylene sealant layer
- Another preferred film structure comprises the layers of
- PET/tie/puncture resistant layer/COC+PE/tie/EVOH/tie/ COC+PE/puncture resistant layer/IO wherein PET represents a polyethylene terephthalate outer layer, each puncture resistant layer independently comprises a blend of cyclic olefin copolymer and ionomer or cyclic olefin copolymer and polypropylene, the COC+PE/tie/EVOH/tie/COC+PE is a barrier layer structure, and 10 represents an ionomer sealant layer.
- the process can comprise coextruding at least one puncture resistant layer, at least one tie layer, and at least one sealant layer to produce a tubular coextruded multilayer film; cooling the
- coextruded tubular multilayer film structure in a first bubble; orienting (e.g., mono- or bi-axially) the coextruded tubular multilayer film structure under heating in a second bubble; and relaxing the oriented coextruded tubular multilayer film structure under heating in a third bubble.
- the tubular coextruded multilayer film structure can be heated in the second bubble to a temperature between the glass transition temperature of the at least one puncture resistant layer and the melting point of the at least one puncture resistant layer, such as to a temperature of from 60 to 95 °C, or 75 to 95 °C
- the tubular coextruded multilayer film structure can be heated in the third bubble to a temperature between the glass transition temperature of the puncture resistant layer and the melting point of the puncture resistant layer, to a temperature that is inferior to the temperature in the second bubble, or the coextruded multilayer film structure can be heated in the third bubble to a temperature of from 65 to 95 °C, or 75 to 95°C, or in the cases of LLDPE to temperatures of 95 to 125 °C, or PP to temperatures of 95 to 136 °C.
- This triple bubble process may allow for the manufacture of coextruded multilayer film structures comprising at least one puncture resistant layer having excellent barrier properties as well as good mechanical properties, excellent heat shrink performance and
- the step of coextruding the puncture resistant layer, tie layer and sealant layer may be carried out by connecting multiple feeders
- the COC and at least one ionomer or polyolefin of the puncture resistant layer can be fed into the extruder in the form of a "salt and pepper blend" by methods known in the art such as to form the
- the polymers making up the tie layer and making up the sealant layer can be fed into the extruder by methods known in the art such as to form corresponding layers in the tubular coextruded multilayer film structure.
- the coextruded multilayer film comprises an outer layer giving the coextruded multilayer film structure mechanical resistance and/or printability, or comprises one or more additional functional layers such as barrier layers and/or other functional layers
- the corresponding materials can be fed, in a manner known in the art, into the extruder by connecting additional feeders to it and redirecting the melt into the desired areas of the circular or annular die.
- the first bubble B1 is formed on one end by the tubular multilayer film structure having a diameter of D1 exiting the circular or annular die of the extruder, and on the other end by the set of rolls R1 that form the hermetically closed end of the first bubble B1 .
- the tubular multilayer film exiting the die and having an initial diameter D1 is quickly cooled, or quenched, in a way such as to obtain a minimum amount of crystallization in the structure.
- Said quick cooling, or quenching is preferably obtained by quenching the exiting tubular coextruded multilayer film through a first water bath W1 having a temperature of from 0.1 °C to 50 °C, more preferably of from 0.1 °C to 25 °C and a length of from 0.4 to 5 m, preferably of from 1 to 3 m.
- the residence time in the water bath W1 may be adjusted to range of from 1 to 20 seconds, more preferably from 10 to 20 seconds.
- the now solidified tubular coextruded multilayer film structure is then passed through a set of rolls which are immersed in a second water bath W2 having a temperature of from 60 to 95 °C.
- the second water bath has a variable length of from 0.4 to 5 meters and the residence time in this bath depending on the speed of the film line can be from 1 to 20 seconds, more preferably from 10 to 20 seconds.
- the second water bath W2 pre-heats the solidified tubular coextruded multilayer film passing through to a temperature where it can be stretched without ripping, of more than 60 °C, preferably from 60 °C to 95 °C, more preferably from 75 °C and 95 °C.
- the solidified tubular coextruded multilayer film is heated to a temperature above the glass transition temperature of the layer having the highest glass transition temperature, which in the case of the present invention is the at least one puncture resistant layer.
- the second water bath W2 may be replaced by or supplemented with any suitable heating means, such as for example a hot air blower, an IR heater or heating coils.
- a hot air blower may be set to a temperature of from 140 to 160 °C, which will heat the tubular coextruded multilayer film to a temperature of from 75 °C to 95 °C because of the low heat capacity of air, and the hot air blower is preferably located
- the now softened tubular coextruded multilayer film structure is inflated to form the second bubble.
- Forming the softened tubular coextruded multilayer film structure allows for the structure to be oriented by drawing in both machine/axial direction (MD) and transverse/radial direction (TD) in the second bubble B2, at the same time.
- the drawing in the machine/axial direction (MD) can be achieved by adjusting the speed V2 of a second set of nip rolls R2 that form the upstream (towards the extruder) end of the second bubble and the speed V3 of a third set of nip rolls R3 that form the downstream (away from extruder) end of the second bubble.
- V3 is greater than V2, preferably 2 to 4 times greater than V2.
- the ratio given by V3A/2 is equivalent to the drawing ratio and is preferably of from 2 to 4.
- the drawing in the transverse/radial direction (TD) can be achieved by adjusting the pressure P1 within the second bubble B2.
- the distance L1 between a first set of nip rolls R2 that form the hermetically closed upstream (towards the extruder) end of the second bubble B2, and a second set of nip rolls R3 that form the hermetically closed downstream (away from extruder) end of the second bubble B2 can be adjusted. Reducing the distance L1 between the two sets of nip rolls (R2 and R3) will increase the pressure P1 , whereas increasing the distance L1 will lower the pressure P1 within the second bubble.
- the initial diameter D1 of the softened tubular coextruded multilayer film structure can be increased to a diameter D2, wherein the ratio between D2 and D1 is of from 2 to 5, preferably of from 2.5 to 3.5.
- the drawn tubular coextruded multilayer film structure While passing through the third set of nip rolls R3, the drawn tubular coextruded multilayer film structure is flattened to be more easily conveyed.
- the tubular coextruded multilayer film structure is passed through a fourth set of nip rolls R4 that form the hermetically closed upstream (towards the extruder) end of the third bubble B3, and a fifth set of nip rolls R5 that form the hermetically closed downstream (away from extruder) end of the third bubble B3.
- the fourth and fifth set of nip rolls (R4 and R5) are separated by a distance L2 that can be adjusted to increase or decrease the pressure P2 within the third bubble B3 in order to allow the previously drawn tubular coextruded multilayer film structure to relax in transverse/radial direction (TD).
- the pressure is adjusted by modifying the distance L2 between the fourth and the fifth set of nip rolls (R4 and R5) of the third bubble B3, which pressure adjustment may modify the diameter D3.
- the relaxation ratio is given by the ratio of D3/D2, whereas D3 is usually lesser than D2 and concurrently the ratio of D3/D2 is smaller than 1 .
- the ratio of D3/D2 can be of from 0.8 and 0.95, more preferably between 0.85 and 0.9.
- the speed V4 of the fourth set of nip rolls R4 and the speed V5 of the fifth set of nip rolls may be adjusted in order to allow the previously drawn tubular coextruded multilayer film to relax in machine/axial direction (MD).
- V5 is lesser than V4.
- the relaxation ratio is given by V5A/4, whereas V5 is usually lesser than V4 and concurrently the ratio of V5A/4 is smaller than 1 .
- the ratio of V5/V4 can be of from 0.8 to 0.95, more preferably of from 0.85 to 0.9.
- the temperature of the coextruded multilayer film structure in the third bubble, the pressure P2 and the ratio of V5/V4 may be adjusted individually or in parallel to achieve a tubular coextruded multilayer film exhibiting a thermal shrink ranging of from 1 to 60 percent, more preferably of from 30 to 60 percent, in machine/axial direction (MD) and/or transverse/radial direction (TD), when measured by immersion of a sample into a water bath at a temperature of 85°C for 10 seconds.
- MD machine/axial direction
- TD transverse/radial direction
- the tubular multilayer film is relaxed in the third bubble B3 under heating.
- an appropriate heating means may be used, such as an IR heater, steam or heated air heater.
- the temperature of the coextruded multilayer film structure in the third bubble B3 is lower than in the second bubble with the proviso of being between the glass transition temperature of the at least one puncture resistant layer and the melting point of the at least one puncture resistant layer.
- the tubular coextruded multilayer film After passing through the fifth set of nip rolls R5, the tubular coextruded multilayer film is passed through a set of rolls, flattened and stored on a roll S.
- the tubular coextruded multilayer film exiting the fifth set of nip rolls R5 can be slit on one side by a slitting knife K to yield a planar coextruded multilayer film that can be stored on a roll S.
- the above process provides for the manufacture of a coextruded multilayer film comprising at least one, preferably mono- or bi-axially oriented, puncture resistant layer, at least one tie layer and at least one sealant layer.
- the coextruded multilayer film structure may be used in particular in packaging applications such as in the manufacture of shrink bags, but may also be used in non-packaging applications such as for example, manufacture of tapes or textiles for building, landscaping, or garment applications.
- the invention further provides for a packaging article comprising a coextruded multilayer film structure comprising at least one of mono- or bi- axially oriented puncture resistant layer, at least one tie layer and at least one sealant layer.
- the packaging article may be used for the packaging of food ingredients having sharp, pointed and/or cutting edges such as for example coffee, rice, meat containing bone or bone splinters, or dry noodles.
- the coextruded multilayer film structure may be used in the packaging article as a lidding film or as a shrink film.
- PET polyethylene terephthalate polyester, commercially available as Lighter C93 from Lighter.
- Tie1 ethylene acrylate copolymer, melt flow rate (MFR, determined according to ASTM D 1238 at 190 °C/2.16kg) of 2, commercially available as Bynel ® 22E780 from DuPont.
- Tie2 LLDPE modified (grafted) with maleic anhydride, commercially available as Bynel ® 41 E850 from DuPont.
- Tie3 maleic anhydride grafted polyolefin commercially available as AdmerTM SF730.
- PE low density polyethylene commercially available as LDPE 2420F, from Dow Chemical Company.
- COC a COC copolymer of ethylene and norbornene with a MFR
- Tg glass transition temperature
- PA nylon-6, commercially available as Grilamid ® F40 from EMS
- CoPA nylon-66/610 copolymer commercially available as Grilon ® G 20 from EMS Chemie.
- CoPP polypropylene copolymer commercially available as Adsyl ® 6C30F from Lyon-Bassell.
- EVOH ethylene vinyl alcohol copolymer commercially available under the designation SP2904, from EVAL.
- ION1 copolymer of ethylene with 15% methacrylic acid and a melt flow index (MFI) of 0.7, 58% neutralized with Zn.
- mPE a metallocene catalyzed ethylene-hexene copolymer, commercially available under the designation ExceedTM 2018 from ExxonMobil
- Multilayer blown films as summarized in Table 1 and 2 can be prepared on a triple bubble blown film machine manufactured by Kuhne Anlagenbau equipped with 1 1 extruders with gear pumps and screws with defined but different length/diameter ratios for different materials.
- the compositions for each of the layers as summarized in Tables 1 and 2 were fed to the respective extruders of the triple bubble extruder. This was a
- the materials were fed from separate feeders into separate extruders and coextruded through an annular die to provide coextruded multilayer films.
- the extruders were operated with temperature profiles as follows for the materials used in the layers. Material Feed zone to final zone (left to right) PET 230-260-260-260-260-260-280-280 °C
- the final temperature of the melt in the die was between 250 and 260 °C.
- a typical blown packaging film was prepared and is summarized in Table 1 as Comparative Example C1 .
- This structure contained a polypropylene copolymer core without a barrier layer or a puncture resistant layer.
- This film had a relatively low puncture resistance.
- Example 1 a film of the invention, has an identical structure to
- Comparative Example C2 except that a polyethylene-COC blend, a puncture-resistant composition, was used in place of polyethylene in layers 3 and 4.
- the extruders were set up to run with the following output relationship: 7/7/30/6/5/8/6/8/5/3/15 (in %).
- Table 2
- the resultant films were tested for puncture resistance according to a DIN14477 or EN388 test at a speed of 1 mm/min using a rod bearing a spherical ball at its tip, the rod having a diameter of 2 mm and the spherical ball having a diameter of 2.5 mm. In these tests the rod was placed in contact with the inside layer (layer 1 1 ). The results are shown in Tables 1 and 2. Example 1 had good puncture resistance.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201261592884P | 2012-01-31 | 2012-01-31 | |
US201261592870P | 2012-01-31 | 2012-01-31 | |
PCT/US2013/024022 WO2013116445A1 (fr) | 2012-01-31 | 2013-01-31 | Film multicouche comprenant un copolymère oléfinique cyclique |
Publications (2)
Publication Number | Publication Date |
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EP2809511A1 true EP2809511A1 (fr) | 2014-12-10 |
EP2809511B1 EP2809511B1 (fr) | 2020-03-04 |
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Family Applications (1)
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EP13703306.4A Active EP2809511B1 (fr) | 2012-01-31 | 2013-01-31 | Film multicouche comprenant un copolymère oléfinique cyclique |
Country Status (6)
Country | Link |
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US (1) | US9783352B2 (fr) |
EP (1) | EP2809511B1 (fr) |
JP (1) | JP6230127B2 (fr) |
CN (2) | CN104080603B (fr) |
ES (1) | ES2778056T3 (fr) |
WO (1) | WO2013116445A1 (fr) |
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-
2013
- 2013-01-31 EP EP13703306.4A patent/EP2809511B1/fr active Active
- 2013-01-31 ES ES13703306T patent/ES2778056T3/es active Active
- 2013-01-31 WO PCT/US2013/024022 patent/WO2013116445A1/fr active Application Filing
- 2013-01-31 US US14/375,144 patent/US9783352B2/en active Active
- 2013-01-31 CN CN201380006916.1A patent/CN104080603B/zh active Active
- 2013-01-31 JP JP2014555691A patent/JP6230127B2/ja not_active Expired - Fee Related
- 2013-01-31 CN CN201810156136.XA patent/CN108189498B/zh active Active
Also Published As
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JP2015512801A (ja) | 2015-04-30 |
US20140370278A1 (en) | 2014-12-18 |
ES2778056T3 (es) | 2020-08-07 |
CN104080603B (zh) | 2018-04-06 |
CN104080603A (zh) | 2014-10-01 |
US9783352B2 (en) | 2017-10-10 |
EP2809511B1 (fr) | 2020-03-04 |
CN108189498B (zh) | 2020-06-23 |
WO2013116445A1 (fr) | 2013-08-08 |
JP6230127B2 (ja) | 2017-11-15 |
CN108189498A (zh) | 2018-06-22 |
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